Table 3

SDSG classification system of lumbosacral spondylolisthesis

Slip grade
Sacro-pelvic balance
Spino-pelvic balance
Spondylolisthesis type

Low-grade
Normal pelvic incidence
--
Type 1



High pelvic incidence
--
Type 2

High-grade
Balanced
--
Type 3



Unbalanced
Balanced
Type 4





Unbalanced
Type 5

Mac-Thiong et al. Scoliosis 2008 3:19   doi:10.1186/1748-7161-3-19